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For those who don't know, the Tendo is a device which you can use to measure the peak/avg. velocity of your lifts. I've always wanted one, but at $1600 (http://store.sorinex.com/Tendo-Weightlifting-Analyzer-p/t-2.htm) it was way out of my price range.
In fact, Vargas' average fastball velocity of 88.82 mph before he landed on the DL is actually a career-high, though his four-seamer has averaged somewhere between 87.48-88.82 mph every year since 2007.